..oO(Alejandro)
>Imagine i have a class in php, and differents users create their
instances of my class. These instances will be visibles between each
other?
No.
>Someone explain how php will manage this, and how i should
acces these differents instances.
You should read about how HTTP and PHP work. Each request is completely
independent from each other. There could be a hundred users on your site
at the same time (assuming your server could handle that) - each one has
his own connection to the server, his own session, more or less his own
PHP interpreter and his own instance of your class.
Micha